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I use two linphone UAs in my lab, each verified
with 'sipomatic'. Yet one can hear only the ring tones
of connection attempts. Once the connection is
established there is silence. Also there are no RTP
packets exchanged. This is indicated on the console by
linphone logs. One can also do a 'tcpdump' to confirm
that.

Also I it will be of great use if there is something
like a design document for the linphone.